DOI: 10.1175/JCLI-D-13-00103.1
Scopus记录号: 2-s2.0-84950112604
论文题名: Interdecadal baroclinic sea level changes in the North Pacific based on historical ocean hydrographic observations
作者: Suzuki T. ; Ishii M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 11 起始页码: 4585
结束页码: 4594
语种: 英语
Scopus关键词: Ocean currents
; Sea level
; Wind stress
; Inter-decadal variability
; North Pacific Ocean
; Ocean circulation
; Pacific decadal oscillation
; Water mass
; Oceanography
; baroclinic motion
; decadal variation
; hydrography
; oceanic circulation
; Pacific Decadal Oscillation
; sea level change
; water mass
; Pacific Ocean
; Pacific Ocean (North)
英文摘要: Using historical ocean hydrographic observations, decadal to multidecadal sea level changes from 1951 to 2007 in the North Pacific were investigated focusing on vertical density structures. Hydrographically, the sea level changes could reflect the following: Changes in the depth of the main pycnocline, density gradient changes across the pycnocline, and modification of the water mass density structure within the pycnocline. The first two processes are characterized as the first baroclinic mode. The changes in density stratification across the pycnocline are sufficiently small to maintain the vertical profile of the first baroclinic mode in this analysis period. Therefore, the first mode should represent mainly the dynamical response to the wind stress forcing. Meanwhile, changes in the composite of all modes of order greater than 1 (remaining baroclinic mode) can be attributed to water mass modifications above the pycnocline. The first baroclinic mode is associated with 40-60-yr fluctuations in the subtropical gyre and bidecadal fluctuations of the Kuroshio Extension (KE) in response to basin-scale wind stress changes. In addition to this, the remaining baroclinic mode exhibits strong variability around the recirculation region south of the KE and regions downstream of the KE, accompanied by 40-60-yr and bidecadal fluctuations, respectively. These fluctuations follow spinup/spindown of the subtropical gyre and meridional shifts of the KE shown in the first mode, respectively. A lag correlation analysis suggests that interdecadal sea level changes due to water mass density changes are a secondary consequence of changes in basin-scale wind stress forcing related to the ocean circulation changes associated with the first mode. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50390
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Integrated Climate Change Projection Research, Japan Agency for Marine-Earth Science and Technology, Yokohama, Kanagawa, Japan; Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Ibaraki, Japan
Recommended Citation:
Suzuki T.,Ishii M.. Interdecadal baroclinic sea level changes in the North Pacific based on historical ocean hydrographic observations[J]. Journal of Climate,2015-01-01,28(11)